Key-bolt.



F.- L. H. SIMS.

KEY BOLT.

APPLICATION FILED FEB. 15. 1916.

1,266,334. Patented May14, 1918.

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FREDERICK I4. H.

' KEY-Bonn Applicationfiled February 15, 1e1e. seriaina'isnsab.

To all whom it may concern: Be it known that I, FREDERICK L. H. SIM

of the city of Toronto, in the county of York, Province of Ontario, Canada, have invented certain new and useful Improvements in Key-Bolts, of which the following is a specification.

My invention employing a key passing through a slot in the bolt as in my prior United States Patent No. 1,000,445 bearing dateof August 15th,

a 1911, and my object is to increase the holding methods of construction and tempering, I,

employ a special modification in the form of the stem of the bolt which enables me to avoid any diminution in the area of metal in the cross section ofthe bolt where the slot occurs and without interfering. with its free passage through the standard forms of in the rail web and splice bars. The invention is hereinafter more particularly described and is illustrated in the ac companying drawings in which- Figure 1 is a plan View of the blank from which the bolt is formed;

Fig. 2 a side elevation of the same;

Fig. 3 a plan view of the finishedbolt;

Fig. 4 a horizontal section showing the key in position; v i

Fig. 5 a cross section through the cylindrical part of the bolt;

Fig. 6 a face view of part of the front.

splice bar with the bolt in section;

Fig. 7 a similar view showing a modification of the hole in the splice bar; and

Fig. 8 a vertical section through a rail and splice bar with one of my bolts in position.

In the drawings like numerals of refer ence indicate corresponding parts in the different figures.

In standard practice the web of the rail is drilled for the passage of the bolt, and in an 80 lb. rail using iv" bolts, the circular hole drilled in the web has a diameter of 11 5 allowing an annulus for expansion and contraction of the web about the bolt of each way more or less. In the splice bars relates to bolts intended particularly for fastening rail. joints, and

holes Specification of Letters Patentj P atentedMay 1451918."

used with suclra, rail, the holes-are based on a 1 circle but are'elongated, the forms shown in;.Figs:6 and 7 being two that are commonlyemploye'd. In Fig. 7 the hole is shownas ellipsoidal in form, and in Fig. 6 lozenge shaped with rounded corners. These elongations ofthe holes are used to receive thersnugs which are formed. about the. part of thestem; of the ordinary bolt immediately adjacent tothe head, thus holding the stem of the bolt from turning when the nut is being tightened.

I tak advantage as the fact that, with these "standard forms of holes in the rail webs and splice bars, a bolt withslot and key. need not. be of circular .cross section throughout its length,and so shape the portion of the stem in which the slot is formed as to secure thesame cross sectional area ofmetal at this {portion as through the solid.

portion ofthe stem near the head.

.Theexact shape ofthe slotted portion of thezboltdepends on the form of the hole in,

the splice bar withwhich the bolt'is to be employed. (See Figs. 6 and 7);, v

' One form ofthe bolt is formed from the blankshown in Figs. 1 and 2. The blank,

when the slotted portion is shaped in section to pass through an ellipsoidal hole in a splice bar as shown in Fig. 7, comprises a half round bar having the central portion 1 reduced inthickness for a length substantially equalto twicethe length of the slot in the finished bolt. is; formed by displacing the metal transversely of the blank instead of longitudinally, so that while the cross sectional shape of the blank at its central portion is changed in form, the area remains thev same. The change of form must be such as will not make the width at this point greater than the diameter of the hole in the rail web, an ellipsoidal form such as shown in the cross sections being preferable.

The blank as shown may be formed by rolling, stamping, or forging as may seem best. The bolt is formed from the blank by bending it at the middle to bring the parts together as shown, and the end of the cylindrical portion 2 of the bolt so formed upset to form the head 3. On the head may be formed the guide teat 4 part on each half of the head. This guide teat serves to guide the user as to the proper direction for the insertion of the key.

This reduction in thickness SIMS, or rono v'ro; ONTARIO, onnnna, nssrenon. TO THE DIAPHONE SIGNAL COMPANY, LIMITED, or rononro, CANADA.

ing the maintenance ofthe same cross sec tional area of metal in the slotted portion ofthe bolt as in the cylindrical portion,

while insuring that the deformed portion will pass freely through the hole in the web of the rail and preferably fits the hole in the splice bar so that it willnot accidentally shift its position rotatively before the key is driven, it is evident that the shape of the half cross sections of the slotted portion may be considerably varied. For instance, in Fig. 6 in which a splice bar with a lozenge shaped hole isshown the metal displaced informing the slot increases the diameter of'the bolt in an inclined direction transversely of the slot instead of in the directionof the depth of the slot.

- Other variations will readily occur to the mind of any skilled mechanic which would fall under the scope of my invention as de fined in the appended claims.

The halves of the bolt may be welded together if desirechbut it will be found that the bolt is fully as strong with the split extending from the head through the cylin drical portion of the bolt to the adjacent end of the slot.

The particular shape of the bolt is of great advantage as it is almost twice as strong as the ordinary screw bolt which loses a very considerable percentage of its effective cross sectional area due to the threading, and so also a slotted bolt as shown in myprior patent having circular external cross sectional contours for the whole length of its stem loses almost the same proportion of strength as the threaded bolt. The bolt disclosed in the present application loses nothing, the strength at any point in its incense length being as great as is possible, while leaving the necessary clearance where the bolt passes through the web of the rail. Further, the changed shape of the bolt in the slotted portion enables me to dispense with the snugs specified in the prior patent referred to, as it serves to hold the bolt from turning in the splice bar while the key is being driven or otherwise manipulated.

hat I claim as my invention is:

l. A substantiallycylindrical bolt provided with a headand a stem, the portion of the stem remote from the head having a substantially fiat sided slot formed longitudinally therein, said slotted portion being increased slightly in periphery to give a cross sectional area of metal therein substantially equal to that in the non-slotted portion of the stem.

c A blank for a slotted key bolt comprising metal bar with atlat face havingthe middle portion of its flat face offset, the cross section of the metal in the central portion being substantially equal to thatin the end portions.

8. A blank for a slotted key bolt comprising a half-round metal bar having its middle port-ion reduced in thickness and increased in width to maintain substantially the same cross section of metalin the portion of reduced thickness as in the other parts of the bar.

l. A blank for a slotted key bolt comprising a'half-round metal bar'hav'ing its middle portion reduced in thickness and increased in width in semi-ellipsoidal form-to maintain substai'itially the same cross section of metal in the portionof reduced thickness a'sin the other parts of the bar.

Signed at Toronto, this 10th day of February, A. D. 1916, in the presence of'lthe two undersigned witnesses.

FREDERICK L. H. Sill IS.

VJitnesses V 1. Bow. ltLn'nnn, E. P. Hahn topless or thtapatent may be obtained for five cents each, by addressing the Commissioner a Patents Wealtlngtanih it. x V 

